package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.nio.file.CopyOption;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Resource
    private RedisTemplate redisTemplate;

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //获取手机号
        String phone=loginForm.getPhone();
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(loginForm.getPhone())) {
            return Result.fail("手机号格式错误");
        }
        //2.校验验证码
        if (RegexUtils.isCodeInvalid(loginForm.getCode())) {
            return Result.fail("验证码格式错误");
        }
//        Object cacheCode = session.getAttribute("code");

        // TODO 从redis中获取验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);

        String code = loginForm.getCode();
        if (cacheCode==null || !cacheCode.equals(code)){
            //3.不一致，报错
            return Result.fail("验证码错误！");
        }
        //4.一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();
        //5.判断用户是否存在
        if(user==null){
            //6。用户不存在，创建用户
            user = createUserWithPhone(phone);
        }
//        //7.保存用户信息到session中
//        session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));

        // 7.保存用户信息到 redis中
        // todo 7.1.随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString();
        // todo 7.2.将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        // todo 7.3.存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
        // todo 7.4.设置token有效期
        stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.MINUTES);

        // 8.返回token
        return Result.ok(token);

    }

    @Override
    public Result sign() {
        //获取登录用户
        Long userId = UserHolder.getUser().getId();
        //获取当前日期
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String format = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = "sign:"+ userId + format;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //写入redis select key offset 1
        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth -1, true);//true代表 1为签到，0为未签到
        return Result.ok();
    }

    /**
     * 统计签到次数
     * @return
     */
    @Override
    public Result signCount() {
        //获取登录用户
        Long userId = UserHolder.getUser().getId();
        //获取当前日期
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String format = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = "sign:"+ userId + format;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //获取本月截至今天为止的所有签到记录，返回的是一个十进制的数字 BITFIELD sign：5：202203 GET u14 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()){
            //没有任何签到结果
            return  Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0){
            return Result.ok(0);
        }
        //循环遍历
        int count = 0;
        while (true){
            //让这个数字与1做与运算，得到数字的最后一个bit位   //判读这个bit位是否为0
            if ((num & 1) == 0){
                //如果为0，说明未签到，结束
                break;
            }else {
                //如果不为0，说明已签到，计数器加1
                count++;
            }
            //把数字右移一位，抛弃最后一个bit位，继续下一个bit位
            num >>>= 1;
        }
        return Result.ok(count);
    }


    private User createUserWithPhone(String phone) {
        //创建用户
        User user=new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+ RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;

    }
}
